circular pattern

Hi everyone, How can I draw the attached part using only sheet metal environment in Alibre? It is way faster not using sheet metal, because I cannot do circular pattern for a body created by sheet metal commands. If I could make a circular pattern of the first "Contour Flange" feature, it...

I'm trying to do a circular pattern of a chamfer. If I add all the edges to the chamfer operation it works, but when I try to pattern a single chamfer I get the error com.alibre.design.ops.ChamferDDOperation: Operation(s) selected can not be patterned alone. What is this error trying to tell...